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</pre></div><pre class="rust"><code><span class="kw">use </span><span class="kw">super</span>::CriticalSection;
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<span class="kw">use </span>core::cell::{Ref, RefCell, RefMut, UnsafeCell};
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<span class="doccomment">/// A mutex based on critical sections.
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///
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/// # Example
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///
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/// ```no_run
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/// # use critical_section::Mutex;
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/// # use std::cell::Cell;
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///
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/// static FOO: Mutex<Cell<i32>> = Mutex::new(Cell::new(42));
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///
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/// fn main() {
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/// critical_section::with(|cs| {
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/// FOO.borrow(cs).set(43);
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/// });
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/// }
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///
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/// fn interrupt_handler() {
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/// let _x = critical_section::with(|cs| FOO.borrow(cs).get());
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/// }
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/// ```
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///
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///
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/// # Design
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///
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/// [`std::sync::Mutex`] has two purposes. It converts types that are [`Send`]
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/// but not [`Sync`] into types that are both; and it provides
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/// [interior mutability]. `critical_section::Mutex`, on the other hand, only adds
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/// `Sync`. It does *not* provide interior mutability.
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///
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/// This was a conscious design choice. It is possible to create multiple
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/// [`CriticalSection`] tokens, either by nesting critical sections or `Copy`ing
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/// an existing token. As a result, it would not be sound for [`Mutex::borrow`]
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/// to return `&mut T`, because there would be nothing to prevent calling
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/// `borrow` multiple times to create aliased `&mut T` references.
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///
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/// The solution is to include a runtime check to ensure that each resource is
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/// borrowed only once. This is what `std::sync::Mutex` does. However, this is
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/// a runtime cost that may not be required in all circumstances. For instance,
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/// `Mutex<Cell<T>>` never needs to create `&mut T` or equivalent.
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///
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/// If `&mut T` is needed, the simplest solution is to use `Mutex<RefCell<T>>`,
|
||
/// which is the closest analogy to `std::sync::Mutex`. [`RefCell`] inserts the
|
||
/// exact runtime check necessary to guarantee that the `&mut T` reference is
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/// unique.
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||
///
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||
/// To reduce verbosity when using `Mutex<RefCell<T>>`, we reimplement some of
|
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/// `RefCell`'s methods on it directly.
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||
///
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/// ```no_run
|
||
/// # use critical_section::Mutex;
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/// # use std::cell::RefCell;
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///
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/// static FOO: Mutex<RefCell<i32>> = Mutex::new(RefCell::new(42));
|
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///
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||
/// fn main() {
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||
/// critical_section::with(|cs| {
|
||
/// // Instead of calling this
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||
/// let _ = FOO.borrow(cs).take();
|
||
/// // Call this
|
||
/// let _ = FOO.take(cs);
|
||
/// // `RefCell::borrow` and `RefCell::borrow_mut` are renamed to
|
||
/// // `borrow_ref` and `borrow_ref_mut` to avoid name collisions
|
||
/// let _: &mut i32 = &mut *FOO.borrow_ref_mut(cs);
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||
/// })
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||
/// }
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/// ```
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///
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/// [`std::sync::Mutex`]: https://doc.rust-lang.org/std/sync/struct.Mutex.html
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/// [interior mutability]: https://doc.rust-lang.org/reference/interior-mutability.html
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</span><span class="attr">#[derive(Debug)]
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</span><span class="kw">pub struct </span>Mutex<T> {
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||
inner: UnsafeCell<T>,
|
||
}
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||
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<span class="kw">impl</span><T> Mutex<T> {
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<span class="doccomment">/// Creates a new mutex.
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</span><span class="attr">#[inline]
|
||
</span><span class="kw">pub const fn </span>new(value: T) -> <span class="self">Self </span>{
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Mutex {
|
||
inner: UnsafeCell::new(value),
|
||
}
|
||
}
|
||
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||
<span class="doccomment">/// Gets a mutable reference to the contained value when the mutex is already uniquely borrowed.
|
||
///
|
||
/// This does not require locking or a critical section since it takes `&mut self`, which
|
||
/// guarantees unique ownership already. Care must be taken when using this method to
|
||
/// **unsafely** access `static mut` variables, appropriate fences must be used to prevent
|
||
/// unwanted optimizations.
|
||
</span><span class="attr">#[inline]
|
||
</span><span class="kw">pub fn </span>get_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>T {
|
||
<span class="kw">unsafe </span>{ <span class="kw-2">&mut *</span><span class="self">self</span>.inner.get() }
|
||
}
|
||
|
||
<span class="doccomment">/// Unwraps the contained value, consuming the mutex.
|
||
</span><span class="attr">#[inline]
|
||
</span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> T {
|
||
<span class="self">self</span>.inner.into_inner()
|
||
}
|
||
|
||
<span class="doccomment">/// Borrows the data for the duration of the critical section.
|
||
</span><span class="attr">#[inline]
|
||
</span><span class="kw">pub fn </span>borrow<<span class="lifetime">'cs</span>>(<span class="kw-2">&</span><span class="lifetime">'cs </span><span class="self">self</span>, _cs: CriticalSection<<span class="lifetime">'cs</span>>) -> <span class="kw-2">&</span><span class="lifetime">'cs </span>T {
|
||
<span class="kw">unsafe </span>{ <span class="kw-2">&*</span><span class="self">self</span>.inner.get() }
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><T> Mutex<RefCell<T>> {
|
||
<span class="doccomment">/// Borrow the data and call [`RefCell::replace`]
|
||
///
|
||
/// This is equivalent to `self.borrow(cs).replace(t)`
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// This call could panic. See the documentation for [`RefCell::replace`]
|
||
/// for more details.
|
||
</span><span class="attr">#[inline]
|
||
#[track_caller]
|
||
</span><span class="kw">pub fn </span>replace<<span class="lifetime">'cs</span>>(<span class="kw-2">&</span><span class="lifetime">'cs </span><span class="self">self</span>, cs: CriticalSection<<span class="lifetime">'cs</span>>, t: T) -> T {
|
||
<span class="self">self</span>.borrow(cs).replace(t)
|
||
}
|
||
|
||
<span class="doccomment">/// Borrow the data and call [`RefCell::replace_with`]
|
||
///
|
||
/// This is equivalent to `self.borrow(cs).replace_with(f)`
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// This call could panic. See the documentation for
|
||
/// [`RefCell::replace_with`] for more details.
|
||
</span><span class="attr">#[inline]
|
||
#[track_caller]
|
||
</span><span class="kw">pub fn </span>replace_with<<span class="lifetime">'cs</span>, F>(<span class="kw-2">&</span><span class="lifetime">'cs </span><span class="self">self</span>, cs: CriticalSection<<span class="lifetime">'cs</span>>, f: F) -> T
|
||
<span class="kw">where
|
||
</span>F: FnOnce(<span class="kw-2">&mut </span>T) -> T,
|
||
{
|
||
<span class="self">self</span>.borrow(cs).replace_with(f)
|
||
}
|
||
|
||
<span class="doccomment">/// Borrow the data and call [`RefCell::borrow`]
|
||
///
|
||
/// This is equivalent to `self.borrow(cs).borrow()`
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// This call could panic. See the documentation for [`RefCell::borrow`]
|
||
/// for more details.
|
||
</span><span class="attr">#[inline]
|
||
#[track_caller]
|
||
</span><span class="kw">pub fn </span>borrow_ref<<span class="lifetime">'cs</span>>(<span class="kw-2">&</span><span class="lifetime">'cs </span><span class="self">self</span>, cs: CriticalSection<<span class="lifetime">'cs</span>>) -> Ref<<span class="lifetime">'cs</span>, T> {
|
||
<span class="self">self</span>.borrow(cs).borrow()
|
||
}
|
||
|
||
<span class="doccomment">/// Borrow the data and call [`RefCell::borrow_mut`]
|
||
///
|
||
/// This is equivalent to `self.borrow(cs).borrow_mut()`
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// This call could panic. See the documentation for [`RefCell::borrow_mut`]
|
||
/// for more details.
|
||
</span><span class="attr">#[inline]
|
||
#[track_caller]
|
||
</span><span class="kw">pub fn </span>borrow_ref_mut<<span class="lifetime">'cs</span>>(<span class="kw-2">&</span><span class="lifetime">'cs </span><span class="self">self</span>, cs: CriticalSection<<span class="lifetime">'cs</span>>) -> RefMut<<span class="lifetime">'cs</span>, T> {
|
||
<span class="self">self</span>.borrow(cs).borrow_mut()
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span><T: Default> Mutex<RefCell<T>> {
|
||
<span class="doccomment">/// Borrow the data and call [`RefCell::take`]
|
||
///
|
||
/// This is equivalent to `self.borrow(cs).take()`
|
||
///
|
||
/// # Panics
|
||
///
|
||
/// This call could panic. See the documentation for [`RefCell::take`]
|
||
/// for more details.
|
||
</span><span class="attr">#[inline]
|
||
#[track_caller]
|
||
</span><span class="kw">pub fn </span>take<<span class="lifetime">'cs</span>>(<span class="kw-2">&</span><span class="lifetime">'cs </span><span class="self">self</span>, cs: CriticalSection<<span class="lifetime">'cs</span>>) -> T {
|
||
<span class="self">self</span>.borrow(cs).take()
|
||
}
|
||
}
|
||
|
||
<span class="comment">// NOTE A `Mutex` can be used as a channel so the protected data must be `Send`
|
||
// to prevent sending non-Sendable stuff (e.g. access tokens) across different
|
||
// threads.
|
||
</span><span class="kw">unsafe impl</span><T> Sync <span class="kw">for </span>Mutex<T> <span class="kw">where </span>T: Send {}
|
||
|
||
<span class="doccomment">/// ``` compile_fail
|
||
/// fn bad(cs: critical_section::CriticalSection) -> &u32 {
|
||
/// let x = critical_section::Mutex::new(42u32);
|
||
/// x.borrow(cs)
|
||
/// }
|
||
/// ```
|
||
</span><span class="attr">#[cfg(doctest)]
|
||
</span><span class="kw">const </span>BorrowMustNotOutliveMutexTest: () = ();
|
||
</code></pre></div></section></main></body></html> |